Leaf: Definition, Characteristics and Functions (With Diagram https://courses.lumenlearning.com/boundless-biology/chapter/ Give "one word names" for the processes by which these raw materials move across the leaf, as seen in the diagram. Epidermis: It is the outermost layer and secretes a waxy substance called the cuticle. The outermost layer of the leaf is the epidermis. The Palisade cells have lots of chloroplasts in them to help with the process of photosynthesis. Internal structure of a leaf margin guard cells Stoma [plural: stomata] palisade layer spongy layer xylem phloem 9. Let us make an in-depth study of the structure and functions of cell. to allow a lot of light to pas through 12. Consider how the leaf is adapted to photosynthesis, gaseous exchange and transport. Key Concepts The External Structure of a Leaf The typical leaf consists of a flat lamina (leaf blade) at is attached to the stem by means of a petiole The veins of the leaf blade consist of … Spongy Cells: Although theses cells are not at the top of the leaf (they are in the middle) they still do photosynthesis. Why are epidermal cells transparent? It consists of the upper and lower epidermis, which are present on either side of the leaf. Each of these structures, called organelles, carry out a specialized role. A diagram of a plant cell with the organelles labeled. After reading this article you will learn about: 1. Function of the waxy cuticle: prevents loss of water 11. The epidermis houses the guard cells which regulate the movement of water into and outside the cell. Internal structure of a leaf 10. Botanists call the upper side the adaxial surface (or adaxis) and the lower side the abaxial surface (or abaxis). The epidermis aids in the regulation of gas exchange. The cells are at the top of the leaf packed in closely. All leaf cells must have direct cell-to-cell contact with the vascular tissues to receive water and dissolved minerals and to export manufactured sugars. b) Go to mitochondria (energy) c) Cell wall function? Leaf Structure and Function. By means of labelled arrows drawn on the diagram above, show the pathway taken by each of the two raw materials to a cell in the centre of the leaf. Comparison of Prokaryotic Cells and Eukaryotic Cells and 2. Parts of a Plant Cell. Cell is a compartment where all the activities of life takes place. 33)Knowledge of Plant Cells a) Water storage? Structure of a leaf (Source: Wikipedia) Each leaf consists of the following layers. Show with another labelled arrow the direction the energy comes from. The cuticle helps retain water inside the leaf cells. 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